The present application relates to a cascaded H-Bridge medium voltage drive, a power cell, and a bypass module thereof, wherein the bypass module is configured for bypassing a major circuit module of the power cell, while the major circuit module comprises a fuse, a rectifier, a bus capacitor and an H-Bridge inverter, two points led from the H-Bridge inverter being configured as a first output end and a second output end; a bypass circuit comprises a first bridge arm and a second bridge arm; a point led from the first bridge arm is configured as a first input end of the bypass circuit, a point led from the second bridge arm is configured as a second input end of the bypass circuit, and the first input end is electrically connected with the first output end, the second input end is electrically connected with the second output end.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A bypass module of a power cell in a cascaded H-Bridge medium voltage drive, configured for bypassing a major circuit module of the power cell, wherein the major circuit module comprises a fuse, a rectifier, a bus capacitor and an H-Bridge inverter, two points led from the H-Bridge inverter respectively being configured as a first output end and a second output end of the major circuit module, the bypass module comprising a bypass circuit, wherein, the bypass circuit comprises a first bridge arm and a second bridge arm, the first bridge arm has at least one of a first switch element and a second switch element, the second bridge arm has at least one of a first diode and a second diode; a point led from the first bridge arm of the bypass circuit is configured as a first input end of the bypass circuit, a point led from the second bridge arm of the bypass circuit is configured as a second input end of the bypass circuit, the first input end is electrically connected with the first output end of the major circuit module, and the second input end is electrically connected with the second output end of the major circuit module; and when the major circuit module malfunctions and the bypass circuit is switched on for operation, one of the first switch element and the second switch element and one of the first diode and the second diode of the bypass circuit turn on to bypass the major circuit module of corresponding power cell.
2. The bypass module according to claim 1 , wherein, the first switch element is a first IGBT, and the second switch element is a second IGBT.
3. The bypass module according to claim 2 , wherein, the bypass circuit comprises the first IGBT, the second IGBT, the first diode and the second diode; an emitter of the first IGBT is electrically connected with a collector of the second IGBT, an anode of the first diode is electrically connected with a cathode of the second diode, a collector of the first IGBT is electrically connected with a cathode of the first diode, and an emitter of the second IGBT is electrically connected with an anode of the second diode; a conducting wire led from a point between the first IGBT and the second IGBT is configured as the first input end of the bypass circuit; a conducting wire led from a point between the first diode and the second diode is configured as the second input end of the bypass circuit; a first branch is formed by the first diode and the first IGBT, and a second branch is formed by the second diode and the second IGBT; and the first output end of the major circuit module is electrically connected to the first input end of the bypass circuit, and the second output end of the major circuit module is electrically connected to the second input end of the bypass circuit.
4. The bypass module according to claim 3 , wherein, when a current received at the first input end of the bypass circuit is negative, and a current received at the second input end thereof is positive, if the major circuit module of the power cell malfunctions and the bypass circuit is switched on for operation, the first diode and the first IGBT of the bypass circuit turn on to bypass the major circuit module of corresponding power cell, so as to enable the whole cascaded H-Bridge medium voltage drive to keep operating.
5. The bypass module according to claim 3 , wherein, when a current received at the first input end of the bypass circuit is positive, and a current received at the second input end thereof is negative, if the major circuit module of the power cell malfunctions and the bypass circuit is switched on for operation, the second diode and the second IGBT of the bypass circuit turn on to bypass the major circuit module of corresponding power cell, so as to enable the whole cascaded H-Bridge medium voltage drive to keep operating.
6. The bypass module according to claim 2 , wherein, the bypass circuit comprises the first IGBT, the second IGBT, the first diode and the second diode; a collector of the first IGBT is electrically connected with an emitter of the second IGBT, a cathode of the first diode is electrically connected with an anode of the second diode, an emitter of the first IGBT is electrically connected with an anode of the first diode, and a collector of the second IGBT is electrically connected with a cathode of the second diode; a conducting wire led from a point between the first IGBT and the second IGBT is configured as the first input end of the bypass circuit; a conducting wire led from a point between the first diode and the second diode is configured as the second input end of the bypass circuit; a first branch is formed by the first diode and the first IGBT, and a second branch is formed by the second diode and the second IGBT; and the first output end of the major circuit module is electrically connected to the first input end of the bypass circuit, and the second output end of the major circuit module is electrically connected to the second input end of the bypass circuit.
7. The bypass module according to claim 6 , wherein, when a current received at the first input end of the bypass circuit is positive, and a current received at the second input end thereof is negative, if the major circuit module of the power cell malfunctions and the bypass circuit is switched on for operation, the first diode and the first IGBT of the bypass circuit turn on to bypass the major circuit module of corresponding power cell, so as to enable the whole cascaded H-Bridge medium voltage drive to keep operating.
8. The bypass module according to claim 6 , wherein, when a current received at the first input end of the bypass circuit is negative, and a current received at the second input end thereof is positive, if the major circuit module of the power cell malfunctions and the bypass circuit is switched on for operation, the second diode and the second IGBT of the bypass circuit turn on to bypass the major circuit module of corresponding power cell, so as to enable the whole cascaded H-Bridge medium voltage drive to keep operating.
9. The bypass module according to claim 2 , wherein, the bypass circuit comprises the first IGBT, the second IGBT, the first diode and the second diode; an emitter of the first IGBT is electrically connected with an anode of the first diode, an emitter of the second IGBT is electrically connected with an anode of the second diode, a collector of the first IGBT is electrically connected with a cathode of the second diode, and a collector of the second IGBT is electrically connected with a cathode of the first diode; a conducting wire led from a point between the first IGBT and the first diode is configured as the first input end of the bypass circuit; a conducting wire led from a point between the second IGBT and the second diode is configured as the second input end of the bypass circuit; a first branch is formed by the first diode and the second IGBT, and a second branch is formed by the second diode and the first IGBT; and the first output end of the major circuit module is electrically connected to the first input end of the bypass circuit, and the second output end of the major circuit module is electrically connected to the second input end of the bypass circuit.
10. The bypass module according to claim 9 , wherein, when a current received at the first input end of the bypass circuit is positive, and a current received at the second input end thereof is negative, if the major circuit module of the power cell malfunctions and the bypass circuit is switched on for operation, the first diode and the second IGBT of the bypass circuit turn on to bypass the major circuit module of corresponding power cell, so as to enable the whole cascaded H-Bridge medium voltage drive to keep operating.
11. The bypass module according to claim 9 , wherein, when a current received at the first input end of the bypass circuit is negative, and a current received at the second input end thereof is positive, if the major circuit module of the power cell malfunctions and the bypass circuit is switched on for operation, the second diode and the first IGBT of the bypass circuit turn on to bypass the major circuit module of corresponding power cell, so as to enable the whole cascaded H-Bridge medium voltage drive to keep operating.
12. The bypass module according to claim 1 , wherein, the bypass circuit further comprises an absorption circuit, which includes an absorption capacitor connected in parallel across the bypass circuit.
13. The bypass module according to claim 12 , wherein, the absorption circuit further includes a third protection resistor; the absorption capacitor is connected in series with the third protection resistor, and then they are connected in parallel across the bypass circuit.
14. The bypass module according to claim 12 , further comprising a first protection resistor and a second protection resistor, wherein, one end of the first protection resistor is electrically connected with one end of the absorption capacitor, another end of the first protection resistor is electrically connected with one end of the bus capacitor; one end of the second protection resistor is electrically connected with another end of the absorption capacitor, and another end of the second protection resistor is electrically connected with another end of the bus capacitor.
15. The bypass module according to claim 1 , wherein, the bypass circuit further comprises a RC branch and a bypass circuit status detecting unit; the RC branch consists of a fourth resistor and a storage capacitor, the fourth resistor is connected in series with the storage capacitor, and then they are connected in parallel across the bypass circuit; the bypass circuit status detecting unit is connected in parallel with the RC branch and is configured for detecting whether the bypass circuit is on operation.
16. The bypass module according to claim 1 , further comprising a bypass controlling circuit, which is electrically connected with the first switch element and the second switch element and is configured for controlling on or off state of the first switch element and the second switch element.
17. The bypass module according to claim 16 , wherein, the first switch element is a first IGBT, and the second switch element is a second IGBT, and gates of the first IGBT and the second IGBT are connected with the bypass controlling circuit.
18. A power cell of a cascaded H-Bridge medium voltage drive, comprising a major circuit module, a power cell controlling module and a bypass module, wherein, the major circuit module comprises a fuse, a rectifier, a bus capacitor, and an H-Bridge inverter, two points led from the H-Bridge inverter being configured as two output ends of the major circuit module; the bypass module is a bypass module according to claim 1 ; two input ends of the bypass module are coupled to two output ends of the major circuit module, respectively; and the power cell controlling module is electrically connected with the major circuit module and the bypass module.
19. The power cell according to claim 18 , wherein, the power cell controlling module comprises a control circuit and a fault detecting unit; the fault detecting unit is configured for detecting whether the major circuit module malfunctions; the control circuit is configured for transmitting a fault detecting signal when a malfunction is detected by the fault detecting unit.
20. The power cell according to claim 19 , wherein, the fault detecting unit includes a phase lack detecting circuit and/or a bridge arm failure detecting circuit; the phase lack detecting circuit is electrically connected with three-phase inputs of an AC power supply via the fuse, and is configured for detecting whether the major circuit module malfunctions at an AC input end thereof; the bridge arm failure detecting circuit is electrically connected with the H-Bridge inverter, and is configured for detecting whether the H-Bridge inverter malfunctions.
21. A cascaded H-Bridge medium voltage drive, comprising a phase shifting transformer, a power cell and a three-phase load, wherein, the power cell comprises a major circuit module, a bypass module and a power cell controlling module; the major circuit module comprises a fuse, a rectifier, a bus capacitor, and an H-Bridge inverter, two points led from the H-Bridge inverter being configured as two output ends of the major circuit module; the bypass module is a bypass module according to claim 1 ; two input ends of the bypass module are coupled to two output ends of the major circuit module, respectively; and the power cell controlling module is electrically connected with the major circuit module and the bypass module.
22. The cascaded H-Bridge medium voltage drive according to claim 21 , wherein, the phase shifting transformer comprises at least one secondary winding.
23. The cascaded H-Bridge medium voltage drive according to claim 22 , wherein, three-phase outputs of each secondary winding in the phase shifting transformer are connected with three-phase input ends of the power cell, respectively.
24. The cascaded H-Bridge medium voltage drive according to claim 21 , wherein, the power cell controlling module comprises a control circuit and a fault detecting unit; the fault detecting unit is configured for detecting whether the major circuit module malfunctions; the control circuit is configured for transmitting a fault detecting signal when a malfunction is detected by the fault detecting unit.
25. The cascaded H-Bridge medium voltage drive according to claim 24 , wherein, the fault detecting unit includes a phase lack detecting circuit and/or a bridge arm failure detecting circuit; the phase lack detecting circuit is electrically connected with three-phase inputs of an AC power supply via the fuse, and is configured for detecting whether the major circuit module malfunctions at an AC input end thereof; the bridge arm failure detecting circuit is electrically connected with the H-Bridge inverter, and is configured for detecting whether the H-Bridge inverter malfunctions.
26. The cascaded H-Bridge medium voltage drive according to claim 24 , wherein, the bypass module further comprises a bypass controlling circuit, which is electrically connected with the first switch element and the second switch element and is configured for controlling on or off state of the first switch element and the second switch element.
27. The cascaded H-Bridge medium voltage drive according to claim 26 , further comprising a drive controlling system, wherein, when the fault detecting unit detects that the major circuit module of power cell malfunctions, the control circuit generates the fault detecting signal and transmits it to the drive controlling system, then the drive controlling system transmits a control signal to the power cell controlling module, so as to trigger the bypass controlling circuit of the bypass module, whereby the bypass controlling circuit switches the bypass circuit on for operation to bypass the malfunctioned major circuit module.
28. The cascaded H-Bridge medium voltage drive according to claim 26 , further comprising a drive controlling system, wherein, when the fault detecting unit detects that the major circuit module of power cell malfunctions, the control circuit generates the fault detecting signal and transmits it to the drive controlling system, then the drive controlling system transmits a control signal to trigger the bypass controlling circuit of the bypass module, whereby the bypass controlling circuit switches the bypass circuit on for operation to bypass the malfunctioned major circuit module.
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September 27, 2012
May 5, 2015
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